I finally got my old Fuel Pressure Switch off, LHD5642AA. It was on there tight! Turns out I needed a 12mm crowsfoot, even though the new one needs an 11mm to put it back on.

When I finally broke it loose, the threads on the old sensor were messed up. I couldn't thread the new sensor on, so I checked it out and it seems that I needed a 10mm-1.00 tap to fix the thread...

I may have taken it too far. When reinstalling the new sensor, I kept tightening until I snapped the head off of the new sensor, Basically the crowsfoot leveraged the head off while I was tightening the sensor back on.

I ended up removing the broken sensor and am prepared to order a new one, however, did I really botch this up? Did I clear out a tapered female thread in the engine? Does anyone know what the threads are supposed to be? I see 1/8-27 NPT on line, but that can't be right, that's not even close to a 10mm-1.00....right?

 

1/8 gas in either bsp or npt is actually pretty close to 10mm and 27/28 tpi is pretty close to 1mm
pitch.
l assume you mean the oil pressure NOT fuel pressure. You may need to source a replacement "spider" and start again.

 

 

Assuming we are talking about a V12 you need to buy another "spider" That's the small manifold you rethreaded along with the cam oil lines and feed line. I would imagine it will not be hard to source.

 

 

Sorry, not familiar with the six. The "spider" is V12 part (my description) EBC3515 you'll see what l mean.
you may have to replace whatever part your switch screws into or retap to 1/4 bsp/npt and fit a reducer.

 

 

I may do this though:https:
//www.glowshiftdirect.com/1-8-27-npt-female-to-m10-p-1-0-male-thread-adapter/

Looks like the male part will accept the M10-1.00 threads I created and provide a female 1/8-27 threaded hole! Too good to be true??

 

You can be lucky sometimes.
Typo on my part number should be EBC3513.